Pantograph



2 Sheets-Sheet 1. L. WALKUP.

(No Model.)

PANTOGRAPH.

Patented Dec 2, 1890.

2 Sheets-Sheet 2. L. WALKUP.

PANTOGRAPH (No Model.)

H EH Q Patented Dec. 2, 1890.

Mei

UNITED STATES PATENT OFFI E.

LIBERTY YVALKUP, OF ROCKFORD, ILLINOIS.

PANTOG'RAPH.

SPECIFICATION forming part of Letters Patent No. 441,909, dated December2, 1890.

' Application filed March 3, 1890- Serial No. 342,490. (No model.)

To aZZ w/wm it may concern.-

Be it known that I, LIBERTY WALKUP, a citizen of the United States,residing at Rockford, in the county of Winnebago and State of Illinois,have invented certain new and useful Improvements in Pantographs, ofwhich the following is a specification.

The object of my invention is the production of apantograph having adetachable and adjustable tracing-finger; and it consists of certain newand useful features of construction and combinations of partshereinafter described. and point-ed out in the claims.

Referring to the accompanying drawings, which form a part of thisspecification, Figure 1 is a plan View of a pantograph provided with myimprovements. Fig. 2 is a side elevation of the tracing-finger and its.support. Fig. 3 is an enlarged detail fragment-a1 View of the same, theconnection of the fingersupport with the bars of the pantograph beingclearly shown. Fig. 4 is also a view of the same as the last, showingthe inception of the mode of detaching the tracingfingerand its supportfrom the pant-ograph. Fig. 5 isa plan View of the parts that support thetracin g-finger, the latter being removed. Figs. 6 and 7 are enlargedend views of the slides that support the tracing-finger.

Like letters of reference indicate corresponding parts throughout theseveral views.

A A A and B B B are crossed parallel bars hinge-jointed together bymeans of pintles O, which are inserted through holes there in and headeddown on both ends to retain them in their places. The parts justdescribed constitute the frame of the pantograph.

O are holes, arranged in regular series, extending through the bars A AA B B B and having countersinks O in thelower ends thereof. Thefunctions of the holes and countersinks will be fully explainedhereinafter.

D is a tracing-finger having holes D extending therethrough to affordmeans of ad justing the same, and being provided with adownwardly-curved point D for tracing the lines to be reproduced by thepantograph.

E is a base. E is a slide-holder rigidly connected therewith.

E E are slides which support the tracing finger D and afford means ofadjusting the same. g

E is a stud produced at its upper end E" to adapt it to pass through ahole D in and engage with and be disengaged from the traeing-finger D,and having a head E at its lower end adapted to engage wit-h and bedisengaged from the countersink C in the bar B.

E is a bolt mounted in the ways E E", which are fast to the base E.

E is a spring for actuating all the parts shown in Fig. 3, except thebolt E bars I; B, and partE.

E is a stud projecting transversely downward from the bolt E and havinga head E at its lower end adapted to engage with and be disengaged fromthe countersink C in the bar B.

The parts from E to E, inclusive, taken together, will, for convenience,be hereinafter denominated the finger-support, and will be designated bythe letter E G is a hinge-plate pivotally connected with the bar A, andmay be secured to a drawingboard or table by means of a thumb-tack andscrew-eye G G H is a pencil-holder.

H is a pencil.

The tracing-finger D and fingersupport E may be detached from thepantograph-frame in the following manner, (see Fig. 3:) The operatorgrasps the tracing-finger and fingersupport with the thumb andforefinger of one hand at any desired point between the bars B B,pressing the pantograph-frame with the other hand against adrawing-board or the like and pushing all the parts there shown, exceptB B F. and E, over to the position indicated by dotted lines, and liftsthe studhead E out of connect-ion with the bar B, and the endwisepressure being withdrawn therefrom the parts will assume thepositionsshown in Fig. 4. The stud-head E may then be readily disengaged from thebar B. To at-- tach the fingersupport and finger to thepantograph-frame, reverse the mode of operating just detailed. Obviouslythe finger-support with its finger may be attached to the bars B B O atany desired point within the limits imposed by the holes C thereinbetween the IOC bars A B The tracing-finger D may be raised and adjust-ed lengthwise in the slides E E, as indicated by the dotted lines inFig. 2, to any extent desired within the limits of the instrument. Thusit will be seen that a pantograph of the construction herein shown anddescribed has a much Wider operative scope than the instruments of thatgenus now in use.

I elain1 1. In combination, the finger-support; consisting of a base,the slide-holder attached thereto and provided with slides,tl1e stud E,connected with the base, the bolt mounted in Ways supported by the base,the actuatingspring, the stud E projecting from the bolt, and thetracing-finger adapted to operate in LIBERTY WALK UP.

Witnesses:

L. L. MoRRIseN, 'E. F. DoWLINe.

